She listens, but she wonders if this is how others feel when she starts talking about walkers: she knows these words, she understands these concepts, but she can't really imagine it. She has to work hard to imagine it.

She chews on another mouthful of cake while she does, brow furrowing with the effort; she's helped plan small battles, worked out small skirmishes with big groups of walkers, but never anything on the scale he seems to be talking about.

"So - what? How ancient are we talking? In London?"